Note 6 - Securities - Amortized Cost and Fair Values of Securities Available-for-sale (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Amortized Cost	$ 201,873	$ 212,053
Gross Unrealized Gains	297	956
Gross Unrealized Losses	3,828	2,152
Securities Available for Sale, at Fair Values	198,342	210,857
Amortized Cost	201,873	212,053
US Government Agencies Debt Securities [Member]
Amortized Cost	7,580	13,656
Gross Unrealized Gains	36	43
Gross Unrealized Losses	50	32
Securities Available for Sale, at Fair Values	7,566	13,667
Amortized Cost	7,580	13,656
Corporate Debt Securities [Member]
Amortized Cost	11,148	11,177
Gross Unrealized Gains	31	0
Gross Unrealized Losses	52	105
Securities Available for Sale, at Fair Values	11,127	11,072
Amortized Cost	11,148	11,177
Collateralized Mortgage Backed Securities [Member]
Amortized Cost	101,766	120,599
Gross Unrealized Gains	20	39
Gross Unrealized Losses	2,414	1,568
Securities Available for Sale, at Fair Values	99,372	119,070
Amortized Cost	101,766	120,599
US States and Political Subdivisions Debt Securities [Member]
Amortized Cost	80,559	65,679
Gross Unrealized Gains	210	874
Gross Unrealized Losses	1,133	112
Securities Available for Sale, at Fair Values	79,636	66,441
Amortized Cost	80,559	65,679
Other Debt Obligations [Member]
Amortized Cost	820	942
Gross Unrealized Gains	0	0
Gross Unrealized Losses	179	335
Securities Available for Sale, at Fair Values	641	607
Amortized Cost	$ 820	$ 942

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Paragraph 2
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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